Water is essential for almost every part of your body. It helps regulate body temperature, supports normal digestion, cushions joints, helps remove waste and keeps your body functioning properly.
But how much water do you actually need each day?
The answer isn't exactly the same for everyone. Your fluid needs can change depending on your age, body size, activity level, climate, diet, pregnancy or breastfeeding status, and whether you are sick.
How Much Water Should You Drink a Day?
There is no single amount of water that every adult must drink each day.
As a general guide, the NHS recommends that most people aim for around 6 to 8 glasses or cups of fluid a day. This is only a guide, and you may need more in hot weather, during prolonged physical activity, or when you are ill.
Another commonly referenced guideline from the U.S. National Academies estimates total daily water intake at about 3.7 litres for men and 2.7 litres for women. Importantly, these figures include water from all beverages and food, not just plain drinking water.
So, the idea that everyone must drink exactly eight glasses of plain water every day is too simplistic.
What Counts Toward Your Daily Fluid Intake?
Your daily fluid intake doesn't have to come entirely from plain water.
Fluids can come from:
- Plain water
- Milk
- Tea and coffee
- Sugar-free drinks
- Other suitable beverages
- Water-rich foods such as fruits and vegetables
The National Academies' estimates also include water obtained from food.
Water is still an excellent everyday choice because it provides hydration without added calories.
Why Does Your Body Need Water?
Your body constantly loses water through urine, sweat, breathing and other normal processes. Replacing those fluids helps maintain normal body functions.
Water helps your body:
- Maintain a normal temperature
- Lubricate and cushion joints
- Protect sensitive tissues
- Remove waste through urine, sweat and bowel movements
- Support normal physical and mental functioning
Not getting enough fluid can lead to dehydration, which may cause symptoms such as unclear thinking, mood changes, overheating and constipation.
Signs You May Not Be Drinking Enough
Thirst is one obvious signal that your body needs fluids, but it isn't the only one.
You may also notice:
- Darker-than-usual urine
- Urinating less often
- Dry mouth
- Tiredness
- Headache
- Dizziness
- Feeling unusually thirsty
The NHS suggests using urine colour as one practical guide and says that urine should generally be a clear, pale yellow when you are adequately hydrated.
However, urine colour can be affected by certain medicines, supplements and foods, so it should not be treated as a perfect medical test.
Does Everyone Need the Same Amount of Water?
No.
Your fluid requirements can change considerably depending on your circumstances.
Hot Weather
You may need more fluids when temperatures are high because your body loses more water through sweating.
This can be especially important in hot climates or when spending extended periods outdoors.
Exercise
Physical activity increases fluid loss through sweating.
If you exercise for a long period or in hot conditions, you may need additional fluids to replace what you lose.
Fever, Vomiting or Diarrhea
Illness can increase your risk of dehydration.
Fever, vomiting and diarrhea can all cause additional fluid loss, so maintaining hydration becomes particularly important.
Pregnancy and Breastfeeding
Fluid needs can also change during pregnancy and breastfeeding. The NHS recommends paying particular attention to fluid intake during these periods.
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How to Stay Hydrated Throughout the Day
You don't need to drink a large amount of water all at once to stay hydrated. For most people, drinking fluids regularly throughout the day and paying attention to thirst and other signs of hydration is a practical approach. Your needs can increase with heat, exercise, illness and other factors.
1. Keep Water Within Reach
Keeping a reusable water bottle nearby can make it easier to drink regularly, especially while working, travelling or exercising.
You don't have to force yourself to finish a particular number of bottles every day. Instead, use thirst, your activity level and the colour of your urine as practical guides.
2. Drink More During Hot Weather
Hot weather can increase fluid losses through sweating.
If you spend a lot of time outdoors or live in a hot climate, you may need more fluids than you normally drink. Carry water with you and drink regularly rather than waiting until you become very thirsty.
3. Increase Fluids When You Exercise
Physical activity increases water loss through sweat, particularly during prolonged or vigorous exercise.
Drink fluids around your activity and replace fluids lost through sweating. The amount you need depends on how long and intensely you exercise, the temperature and how much you sweat.
For ordinary daily activity, plain water is usually a convenient choice.
4. Eat Water-Rich Foods
Hydration doesn't come only from drinks.
Many foods contain substantial amounts of water, particularly fruits and vegetables. Foods such as watermelon, oranges, strawberries, cucumber, tomatoes and leafy vegetables can contribute to your overall fluid intake.
Including a variety of fruits and vegetables can therefore support both hydration and a balanced diet.
5. Choose Water Instead of Sugary Drinks
Water is a simple way to stay hydrated without adding sugar or calories.
If you regularly drink sugary sodas, sweetened beverages or other high-calorie drinks, replacing some of them with water can reduce your overall calorie intake.
If plain water feels boring, try adding a slice of lemon, lime, cucumber or a few berries for flavour.
6. Don't Worry About Drinking Only Plain Water
Water is an excellent choice, but it isn't the only beverage that contributes to your daily fluid intake.
The NHS notes that lower-fat milk and sugar-free drinks, including tea and coffee, can also count toward daily fluid intake.
The important thing is to consider your overall beverage and food intake rather than focusing only on glasses of plain water.
7. Pay Attention to Your Urine Colour
Urine colour can provide a simple indication of hydration.
The NHS recommends aiming for urine that is generally clear or pale yellow. Darker urine can be a sign that you may need more fluids, although urine colour can also be affected by certain medicines, supplements and foods.
It should be treated as a helpful guide rather than a diagnostic test.
8. Drink More When You're Ill
Illness can increase your risk of dehydration.
Fever, vomiting and diarrhea can cause additional fluid losses. During these situations, maintaining adequate fluid intake becomes particularly important.
If you are unable to keep fluids down, have severe diarrhea or vomiting, or develop significant symptoms of dehydration, seek medical advice.
9. Don't Force Yourself to Drink Excessive Amounts
More water isn't always better.
Healthy people generally have effective mechanisms for regulating water balance, and individual fluid requirements vary considerably. The National Academies notes that there is no single water intake level that applies to everyone under all conditions.
Instead of forcing yourself to drink a very large amount, aim for regular fluid intake that matches your body's needs and your circumstances.
10. Make Hydration a Simple Daily Habit
You can make staying hydrated easier by connecting drinking water with routines you already have.
For example:
- Drink a glass of water with meals.
- Keep a bottle at your desk.
- Take water when travelling.
- Drink before and during longer periods of physical activity.
- Choose water when eating out.
- Add lemon or lime if you prefer flavoured water.
- Keep water accessible during hot weather.
The goal is not to hit an arbitrary number every day. It is to maintain adequate hydration while adjusting your intake when your body loses more fluid.
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